Harness wiring structure

Abstract

To provide a harness wiring structure that suppresses malfunctions in harnesses.SOLUTION: The present invention is a harness wiring structure of a harness that spans between a movable portion and a fixed portion, and the harness is inserted into a tubular member, the tubular member is arranged to span between the movable portion and the fixed portion, and at least one of the movable portion and the fixed portion includes a holding member that holds the tubular member in a rotatable state.SELECTED DRAWING: Figure 3A

Description

[Technical field]

[0001] The present invention relates to a harness routing structure. [Background technology]

[0002] 2. Description of the Related Art Conventionally, in vehicles such as senior cars, wiring on the handlebar side is routed by a harness across between the steering shaft on the movable side and the vehicle body on the fixed side.

[0003] Patent Document 1 discloses a harness routing structure in which a harness is fixed by a clamp. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-203189 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, if there is no slack in the harness between the movable and fixed parts, the movement of the movable part will cause stress to concentrate on the fixed part of the harness. Also, if the harness is routed with slack between the movable and fixed parts, the movement of the harness during movement will be unstable, causing unexpected friction with surrounding parts. This can lead to unintended problems such as harness breakage and abnormal noise.

[0006] An object of the present invention is to provide a harness routing structure that suppresses malfunctions of the harness. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the present invention provides a harness routing structure for a harness that spans between a movable part and a fixed part, wherein the harness is inserted into a tubular member, the tubular member is positioned to span between the movable part and the fixed part, and at least one of the movable part and the fixed part has a holding member that holds the tubular member in a rotatable state. Effect of the Invention

[0008] According to the present invention, problems with the harness can be suppressed. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing an example of a senior car to which a harness routing structure according to an embodiment is applied. [Diagram 2] FIG. 2 is a diagram showing the handlebar area of ​​the senior car shown in FIG. 1 when viewed from the front side of the vehicle body in the + direction of the coordinate axis X. As shown in FIG. [Figure 3A] FIG. 3A is a diagram showing a state in which cover parts around the handle shown in FIG. 2 are removed. [Figure 3B] FIG. 3B is a diagram showing a state after the steering wheel is steered to the right from the neutral state shown in FIG. 3A. [Figure 3C] FIG. 3C is a diagram showing a state after the steering wheel is steered to the left from the neutral state of FIG. 3A. [Figure 4A] FIG. 4A is a partially enlarged view of the corrugated tube and the corrugated clamp of FIG. 3A. [Figure 4B] FIG. 4B is a cross-sectional view of the corrugated tube and the corrugated clamp taken along line AA of FIG. 4A. [Figure 4C] FIG. 4C is a view of the corrugated clamp as viewed from the axial direction of the corrugated tube before being fixed. [Diagram 5] FIG. 5 is a diagram for explaining the movement of the harness accompanying the steering of the steering wheel. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A harness arrangement structure according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings. Note that the present invention is not limited to the following embodiment, and the components in the following embodiment include those that a person skilled in the art can easily conceive, those that are substantially the same, and those that are within the scope of what is called equivalent. Furthermore, various omissions, substitutions, modifications, and combinations of the components can be made without departing from the gist of the following embodiment.

[0011] <Embodiment> As an example of the harness routing structure of this embodiment, a harness routing structure for a harness that spans between a movable part and a fixed part of a vehicle body will be described. As an example, an application example to a handle-type electric wheelchair called a senior car will be shown. Note that senior cars are classified into those with one front wheel and those with two front wheels, and the harness routing structure of this embodiment can be applied to either configuration. In addition, the harness routing structure of this embodiment may be applied to other vehicle bodies, not limited to senior cars.

[0012] Fig. 1 is a perspective view showing an example of a senior car to which a harness arrangement structure according to an embodiment is applied. The senior car 1 shown in Fig. 1 has a body with two front wheels. The senior car 1 has a steering mechanism that applies a steering angle to the front wheels (wheels 12 and 13) according to the turning angle θ of a handlebar 11 between +R and -R.

[0013] The handle 11 is, for example, a bar handle, but may be a handle of another shape, such as a loop handle.

[0014] In addition to the handle 11, the steering wheel includes a steering shaft 15 (see Figs. 3A, 3B, and 3C) that rotates in accordance with the turning angle θ of the handle 11, and a mechanism that operates in conjunction with the rotational movement of the steering shaft 15. The central axis of the steering shaft 15 is the Z1 axis, and the steering shaft 15 rotates around the Z1 axis to provide a steering angle to the front wheels (wheels 12 and 13).

[0015] The mechanism that applies a steering angle to the front wheels (wheels 12 and 13) by rotating the steering shaft 15 is, for example, a link mechanism or a rack-and-pinion mechanism.

[0016] The cover part 14 on the vehicle body front side is provided along the steering shaft 15. The cover part 14 is, for example, a resin part, and has a design function and protects the front of the vehicle body including the steering wheel.

[0017] The handlebar 11 is provided with an instrument meter 111, a reverse switch 112, a brake lever 113, an accelerator lever 114, etc. The braking method may be manual braking using the brake lever 113, or an electromagnetic brake, or a combination of multiple braking methods may be used.

[0018] For the sake of explanation, the seat area of ​​the body of the senior car 1 in Fig. 1 shows the internal structure with the cover parts of the body removed. A steering mechanism including a steering wheel and front wheels (wheels 12 and 13) is provided on the front side of a frame 21 of the body, and motor-driven rear wheels (wheels 22 and 23) are provided on the rear side. The rear wheels (wheels 22 and 23) are suspended from the frame 21 via suspension parts 24 and 25, respectively.

[0019] A bottom surface 26 is disposed near the center of the seat, and a seat 27 is provided whose height is adjusted relative to the bottom surface 26. Vibrations received by the rear wheels (wheels 22 and 23) from the road surface are absorbed and reduced by dampers 28 and 29, respectively.

[0020] Control devices 31 and 32 are provided under the seat 27. The control devices 31 and 32 are supplied with power from a rechargeable battery mounted on the vehicle body via a power supply circuit.

[0021] Various wiring on the rear side, such as wires supplying power to the motors of the rear wheels (wheels 22 and 23) and various signal lines, are bundled into a harness and connected to the control devices 31, 32. Also, various electric wires on the steering side, such as instruments, are bundled into a harness and passed from the steering side, and passed under the bottom surface 26 of the vehicle body to be connected to the rear control devices 31, 32. Note that the number and positions of the control devices 31, 32 are merely examples and are not limited to these. Also, in addition to the control devices 31, 32, relay devices or the like may be provided between the front and rear.

[0022] Next, a detailed description will be given of a harness arrangement structure for a harness that spans between a movable part and a fixed part of a vehicle body. Since this example has a steering wheel, the harness arrangement structure will be described for a harness for instruments, etc. that spans between the steering wheel and the main body frame.

[0023] Fig. 2 is a diagram showing the handlebar 11 and its surroundings when the senior car 1 shown in Fig. 1 is viewed from the front side of the vehicle body in the + direction of the coordinate axis X. Note that the lower side is not shown.

[0024] Fig. 3A is a diagram showing a state in which cover parts 14 around handle 11 shown in Fig. 2 have been removed. In Fig. 3A, a harness routing structure for a harness that spans between a movable part and a fixed part of the vehicle body is exposed.

[0025] Fig. 3B and Fig. 3C are diagrams showing the state of the harness due to steering of the handle. Fig. 3B is a diagram showing the state after steering the handle 11 to the right on the -R side from the neutral state of the handle 11 shown in Fig. 3A, and Fig. 3C is a diagram showing the state after steering the handle 11 to the left on the +R side from the neutral state of Fig. 3A. Here, neutral refers to a state in which the front wheels (wheels 12 and 13) face forward, that is, a state in which the vehicle body moves straight ahead.

[0026] First, the harness arrangement structure of this embodiment will be described with reference to Fig. 3A. In the configuration shown in Fig. 3A, the handle 11, the steering shaft 15 that rotates together with the handle 11, and the movable side plate 150 are a movable part group, and the shaft support part 20 and the fixed side plate 200 are a fixed part group.

[0027] The movable plate 150 is fixed to the shaft of the handle 11 or the steering shaft 15 and rotates integrally with the steering shaft 15, so that it is in the same movable part group as the handle 11 and the steering shaft 15.

[0028] The fixed plate 200 is fixed to the shaft support portion 20 which is a part of the fixed portion of the main body frame, and since the shaft support portion 20 is not linked to the rotational movement of the steering shaft 15, it corresponds to the group on the fixed portion side.

[0029] A wire 41 for an instrument meter 111, a wire 42 for a reverse switch 112 and an accelerator lever 114, and a wire 43 for a brake lever 113 are bundled as a harness 40 and provided by the harness arrangement structure of this embodiment.

[0030] The harness 40 is disposed so as to straddle the movable plate 150 and the fixed plate 200 while being inserted through a corrugated tube 50 which is a tubular member.

[0031] Moreover, the corrugated tube 50 is rotatably held by a holding member on at least one of the movable side plate 150 and the fixed side plate 200. In the embodiment shown in Fig. 3A, the corrugated tube 50 is rotatably held by corrugated clamps 71 and 72, which are holding members, on the movable side plate 150 and the fixed side plate 200, respectively.

[0032] 3A, the harness 40 is fixed to the movable plate 150 from one end on the upper side of the corrugated tube 50 by a band 81, which is a fixing member. The portion fixed by the band 81 fixes the harness 40 from above the tube 60. The harness 40 is inserted into the tube 60, and the inner diameter of the tube 60 is approximately the same as that of the harness 40, so that movement of the harness 40 within the tube 60 is suppressed.

[0033] Further, from one end on the lower side of the corrugated tube 50 to the tip, the harness 40 is fixed to the fixed side plate 200 by a band 82 which is a fixing member.

[0034] In the harness routing structure of this embodiment, the harness 40 is inserted through the corrugated tube 50, so that the section of the harness 40 fixed by the bands 81 and 82 can be separated. This section of the harness 40 is free and has an excess length, so there is almost no restraint, and it is possible to alleviate stress concentration on the harness 40 at the fixed section caused by steering the handlebars 11 to the right or left.

[0035] Incidentally, the band 81 is not necessarily provided, and may be provided when necessary depending on the length of the harness 40 from the corrugated tube 50. Similarly, the band 82 may be provided appropriately at a necessary location when necessary depending on the length of the harness 40 from the corrugated tube 50.

[0036] 4A, 4B, and 4C are diagrams showing the configurations of the corrugated tube 50 and the corrugated clamps 71 and 72. FIG. 4A is a partially enlarged view of the corrugated tube 50 and the corrugated clamps 71 and 72 in FIG. 3A. FIG. 4B is a cross-sectional view of the corrugated clamps 71 and 72 taken along line AA in the corrugated tube 50 and the corrugated clamps 71 and 72 shown in FIG. 4A. FIG. 4C is a diagram showing the corrugated clamps 71 and 72 before being fixed as viewed from the axial direction of the corrugated tube 50. In FIG. 4C, the corrugated tube 50 and the harness 40 are shown by two-dot chain lines so that the configurations of the corrugated clamps 71 and 72 are not difficult to understand. In addition, since both of the two corrugated clamps 71 and 72 have the same configuration, FIGS. 4A, 4B, and 4C show one corrugated clamp at one location.

[0037] As shown in FIG. 4C, the corrugated tube 50 has an inner diameter L larger than the diameter of the harness 40, and a gap D is provided between the inner surface 500 of the corrugated tube 50 and the harness 40 to allow the harness 40 to escape in order to avoid stress concentration at one point due to steering of the handle 11.

[0038] The corrugated tube 50 is a cylindrical member, and is made of, for example, resin or the like, which is capable of being bent or twisted.

[0039] The outer surface of the corrugated tube 50 has a repeating pattern of protrusions 51 provided at a predetermined pitch in the Z2 axis direction. Each protrusion 51 goes around the periphery of the corrugated tube 50, and between adjacent protrusions 51 in the Z2 axis direction there is a groove formed in the circumferential direction of the corrugated tube 50, specifically, a recessed groove 52 going around the periphery of the corrugated tube 50.

[0040] In contrast to the concave and convex configuration of the corrugated tube 50, the corrugated clamps 71, 72 have a convex structure 710 on the inner circumferential surface of the corrugated clamps 71, 72 that fits into the groove 52 of the recess that goes around the periphery of the corrugated tube 50. In the configuration shown in Figures 4B and 4C, the corrugated clamps 71, 72 have the convex structure 710 on the end face side of the corrugated clamps 71, 72 in the direction of the axis Z2 when the corrugated tube 50 is set.

[0041] The corrugated tube 50 is attached by setting the recessed groove 52 going around the periphery of the corrugated tube 50 in a position where it fits into the protruding structure 710 of the corrugated clamps 71, 72. For example, as shown in Fig. 4C, the corrugated tube 50 is attached by inserting the insertion portion 711 of the corrugated clamps 71, 72 into the insertion opening 712 in the direction of the arrow P after the corrugated tube 50 is set in the corrugated clamps 71, 72, and engaging the insertion portion 711 via the notch inside the insertion opening 712.

[0042] The corrugated clamps 71, 72 have joints 713 and are fixed to the movable plate 150 and the fixed plate 200 at the joints 713. For example, the corrugated clamps 71, 72 are fixed by fitting the joints 713 into predetermined holes provided in the movable plate 150 and the fixed plate 200. The corrugated clamps 71, 72 may be fixed to the movable plate 150 and the fixed plate 200 by screws, bolts, or the like.

[0043] 3B and 3C, even when the steering wheel 11 is turned, the convex structures 710 of the corrugated clamps 71, 72 are always accommodated in the grooves 52 of the recesses that go around the periphery of the corrugated tube 50. Therefore, the corrugated tube 50 rotates in a direction that eliminates the twisting force applied to the corrugated tube 50 itself so as to follow the grooves 52 of the recesses that go around the periphery of the corrugated tube 50, without shifting in the axial Z2 direction.

[0044] Fig. 5 is a diagram for explaining the movement of the harness 40 accompanying the steering of the steering wheel 11. Fig. 5 shows the corrugated clamp 71, the corrugated tube 50, and the paths of the harness 40 accompanying the steering of the steering wheel 11. The neutral state in Fig. 3A is shown by a solid line, and the state after steering to the right in Fig. 3B and the state after steering to the left in Fig. 3C are shown by two-dot chain lines. Note that in the states after steering to the right and after steering to the left, for the sake of explanation, part of the corrugated tube 50 is omitted from the illustration to show the orientation of the harness 40 inside the corrugated tube 50.

[0045] From the neutral state indicated by the solid line in FIG. 5, the -R1 direction is the state when steering to the right, and the +R1 direction is the state when steering to the left. Depending on the steering direction of the steering wheel 11, the corrugated clamp 71 rotates integrally with the movable part in the -R direction or the +R direction around the axis Z1. Since the corrugated tube 50 is rotatably held by the corrugated clamp 71, it rotates within the corrugated clamp 71 around the central axis Z2 of the corrugated tube 50 depending on the steering direction of the steering wheel 11. For example, in the case of steering to the right in the -R1 direction, it rotates in the +R10 direction, and in the case of steering to the left in the +R1 direction, it rotates in the -R10 direction. The +R10 direction and the -R10 direction indicate directions that eliminate the twisting force applied to the corrugated tube 50 itself.

[0046] Since the harness 40 is inside the corrugated tube 50, friction with the cover part 14 and surrounding parts is eliminated. In addition, the harness 40 moves together with the corrugated tube 50 when rotated about the axis Z1 by the corrugated clamp 71, but the presence of the gap D between the corrugated tube 50 allows the harness 40 to move while dissipating force applied to the harness 40. This also makes it possible to avoid localized stress concentration on the harness 40.

[0047] In this manner, the harness routing structure of this embodiment is a harness routing structure that actively utilizes the rotation of the movable parts, and the path during movement by the corrugated tube 50 is also stable, so that both stress concentration on the harness 40 and friction with surrounding parts can be suppressed, and unintended malfunctions such as breakage of the harness 40 and generation of abnormal noise can be suppressed.

[0048] As an example, the harness routing structure of this embodiment is applied to a senior car. In a senior car, the speed setting is limited to a low speed, so the maximum turning angle ±θ of the handlebar 11 is, for example, ±45°. The harness routing structure of this embodiment is structured to prevent disconnection and abnormal noise caused by local stress concentration in the harness 40 even at such a turning angle.

[0049] In this embodiment, an example is shown in which the corrugated tube 50 is fixed by the corrugated clamps 71, 72 using the movable side plate 150 and the fixed side plate 200, but the fixing by the corrugated clamps 71, 72 may be either one of the groups on the movable side or either one of the groups on the fixed side.

[0050] The structure of the corrugated clamps 71 and 72 is merely an example, and any structure that allows the corrugated tube 50 to rotate may be used as appropriate. In addition, since an existing corrugated tube and corrugated clamp can be used as substitutes, there is no need to develop new parts, and the cost can be reduced accordingly.

[0051] The corrugated tube 50 is an example of a tubular member. The outer surface of the corrugated tube 50 has a groove 52 of a recess formed by repeating convex portions 51 in the longitudinal direction, but it can be appropriately applied as long as a structure for rotatably holding the tubular member is provided on either or both of the tubular member and the holding member. For example, the outer surface of the tubular member may have a convex structure that goes around the circumference, and the holding member may have a groove into which the convex structure of the tubular member fits. In addition, the convex structure of the tubular member that fits into the groove of the holding member or the convex structure of the holding member that fits into the groove of the tubular member is not limited to a structure that goes around the circumference, but may be provided on a part of it, or may have a structure in which multiple convex structures go around discontinuously. [Explanation of symbols]

[0052] 1. Senior car 11 Handle 15 Steering shaft 20 Shaft support 40 Harness 41 Wiring of instrument meter 111 42 Wiring for reverse switch 112 and accelerator lever 114 43 Brake lever 113 wiring 50 Corrugated tube 60 tubes 71, 72 Corrugated clamp 81 Bands 82 Bands 111 Instrument meter 112 Reverse switch 113 Brake lever 114 Accelerator Lever 150 Movable plate 200 Fixed side plate Z1 Shaft center axis Z2 Corrugated tube 50 shaft

Claims

1. A harness routing structure for a harness spanning a movable part and a fixed part, The harness is inserted through a tubular member, the tubular member is disposed so as to straddle the movable portion and the fixed portion, a holding member for holding the tubular member in a rotatable state on at least one of the movable portion and the fixed portion; Harness routing structure.

2. The tubular member is held on the movable part side. The harness routing structure according to claim 1 .

3. The tubular member is also held by the fixed portion. The harness routing structure according to claim 2 .

4. The movable part is a steering wheel, the fixed portion is a part of a vehicle body portion whose movement is fixed relative to the rotational movement of a steering wheel, The tubular member is held so as to rotate in response to rotation of the steering wheel. The harness routing structure according to any one of claims 1 to 3.

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